4 0
6
0

chôc
®¬n vÞ
0
0
3
2
5
50
+
+
0
5
. 0 céng 0 b»ng 0,
. 3 céng 2 b»ng 5,
viÕt 5
viÕt 0
30 + 20 =
…
3 0
2 0
0

TÝnh:
40
0


TÝnh:
40
0
0
00
0
0
0
0
0
3
5
4
3
3
1
7
2
9
5
0
0
7 0
0
0
0 0
6
8
8